CN109897928A - A kind of manufacturing method of the big thickness steel plate of the continuous casting billet production guarantee anti-lamellar tearing performance of core - Google Patents
A kind of manufacturing method of the big thickness steel plate of the continuous casting billet production guarantee anti-lamellar tearing performance of core Download PDFInfo
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Abstract
The manufacturing method for guaranteeing the big thickness steel plate of the anti-lamellar tearing performance of core is produced the present invention relates to a kind of continuous casting billet.The production method of the big thickness steel plate of the present invention are as follows: continuous casting billet base type is selected according to steel plate thickness, steel grade rank.After converter is just refined, strict control LF refining and RH vacuum refining process, produce high-cleanness, high molten steel, it is controlled again through special continuous casting technique, obtain the satisfactory continuous casting steel billet of center porosity, center segregation, continuous casting steel billet produces anti-lamellar tearing steel plate of good performance, then thermally treated reaches final performance through controlled rolling, control cooling.Steel plate thickness of the invention reaches > 80mm~150mm, anti- lamellar tearing function admirable, Z-direction (thickness direction) Tensile fracture shrinking percentage > 35%, can be widely applied to the construction of the steel constructions such as large bridge, skyscraper at thickness half.
Description
Technical field
The manufacturing method for guaranteeing the big thickness steel plate of the anti-lamellar tearing performance of core is produced the present invention relates to a kind of continuous casting billet.
Belong to metallurgical technology field.
Background technique
With the enlargement of the steel constructions such as skyscraper, bridge, water power, ship, used armor plate strength is increasingly
Height, thickness are increasing, simultaneously as Z-direction (thickness direction) stress, proposes the anti-lamellar tearing performance of steel plate higher and higher
Requirement, not only to guarantee Z-direction (thickness direction) Tensile fracture shrinking percentage at thickness a quarter, but also to guarantee thickness two
Z-direction (thickness direction) Tensile fracture shrinking percentage at/mono- reaches the requirement of > 35%, due to caused by steel metallurgical characteristics itself,
For thick steel plate, guarantee that Z-direction (thickness direction) Tensile fracture shrinking percentage difficulty at steel plate thickness half is bigger, it is past
Reach higher level, but thickness half toward there is Z-direction (thickness direction) Tensile fracture shrinking percentage at thickness a quarter
Locate the underproof problem of Z-direction (thickness direction) Tensile fracture shrinking percentage.The present invention is directed to improve, guarantee that super-thick steel plate thickness two divides
One of the anti-lamellar tearing performance at place, the Z-direction (thickness direction) that improves, guarantee at super-thick steel plate thickness half stretch it is disconnected
Face shrinking percentage reaches the requirement of > 35%, and difficulty and advantage are mainly manifested in:
(1), the anti-lamellar tearing function admirable of steel plate core is in particular at thickness half that Z-direction (thickness direction) is drawn
Stretch contraction percentage of area > 35%；
(2), steel plate thickness is big, reaches > 80mm~150mm；
(3), steel plate is manufactured using continuous casting steel billet.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of continuous casting billet production guarantee core for the above-mentioned prior art
The manufacturing method of the big thickness steel plate of anti-lamellar tearing performance, the anti-lamellar tearing function admirable of steel plate core, thickness reach >
80mm~150mm.
The present invention solves the above problems used technical solution are as follows: a kind of continuous casting billet production guarantees the anti-lamellar tearing of core
The manufacturing method of the big thickness steel plate of performance, first selection continuous casting billet base type.After converter is just refined, strict control LF refining and RH
Vacuum refining process, then controlled through special continuous casting technique, obtain the satisfactory continuous casting plate of center porosity, center segregation
Base, continuous casting steel billet are produced anti-lamellar tearing steel plate of good performance, then thermally treated are reached most through controlled rolling, control cooling
Whole performance.Specific step is as follows:
The first step, the selection of continuous casting billet base type
Select continuous casting steel billet, continuous casting steel billet thickness 370mm~450mm, according to steel grade rank, steel plate thickness and width requirement
It determines specifically used continuous casting steel billet thickness, yield strength 460MPa and following rank, guarantees compression ratio (thickness of strand/steel
Plate thickness) 2.5~5.5, the above rank of yield strength 460MPa, guarantee compression ratio (thickness of strand/steel plate thickness) 3.0~
5.5, if steel plate width exceeds 3000mm, compression ratio (thickness of strand/steel plate thickness) 0.2~0.7 is compensated, is from raw material
Steel rolling provides basic guarantee.Continuous casting billet base type selection emphasis is and the size of steel plate (including thick, wide, long) and steel rolling rolling schedule
It is adapted, increases the effective compression ratio of steel plate.
Second step just refines
Molten iron is pre-processed through KR, and S content takes off to after 0.015% or less, into carrying out in 150t BOF top and bottom combined blown converter
Just refining, control molten steel [P]≤0.015%, control blow only [C] be not less than 0.03%, molten steel temperature after 1640 DEG C~1690 DEG C,
Tapping enters liquid steel refining process into ladle, and the pre-deoxidant of no less than 3kg/t steel is added into molten steel for tapping process, and blows
Enter argon gas stirring molten steel.
Third step, refining
Refining includes LF refining and RH vacuum refining two procedures, and wherein LF refining process makes white slag, the total dosage of refining agent
No less than 20kg/t steel, feeds aluminum steel precipitation desoxydation, and overall process molten steel [AL] content takes off deeply in 0.010% or more, molten steel deep deoxidation
Sulphur, the total refining time of LF are no less than 45min, and molten steel temperature is after 1650 DEG C~1720 DEG C, and into RH vacuum refining process, RH is true
The sky refining < 130Pa condition of high vacuum degree processing time is no less than 15min~30min, and molten steel Ca is handled after RH vacuum refining.Refining knot
Beam must assure that final molten steel [O] content no more than 10ppm, and [H] content is not more than 1.0ppm, and [S] content is not more than
0.002%, [Ca] content reaches 0.0005%~0.0040%, and guarantees that [Ca]/[S] reaches 1.5~4.0.This step emphasis
It is clean steel smelting, remains on continuous manganese sulfide, silicate field trash in steel and seriously affect final steel plate core portion section receipts
Shrinkage reduces these field trashes in terms of this step 1 to the greatest extent, be on the other hand continuous field trash is changed into it is tiny
, the ball punctate appearance of dispersed distribution, greatly reduce its influence to the contraction percentage of area.In addition [H] is also to influence core to break
An important factor for face shrinking percentage, this step is by the removing of its high degree.
4th step, continuous casting steel machine
Molten steel is cast into continuous casting steel billet, slab thickness 370mm~450mm, casting process control on straight circular-arc type continuous casting machine
10 DEG C~25 DEG C of superheat of liquid steel processed, drawing speed 0.3m/min~1.0m/min, electromagnetic agitation electric current 200A~400A, frequency
5HZ~12HZ, dynamic soft-reduction drafts 8mm~16mm, depressing position are finally reached continuous casting billet macrostructure in solidification end
Middle center segregation≤C1.0 grades, center porosity≤1.0 grade, without internal flaws such as middle crack, triangular area cracks.This step is
One of priority control step, center segregation include the macrosegregation of the segregation for remaining on steel inclusion, ingredient and tissue, continuous casting
Base center segregation, center porosity defect directly affect the contraction percentage of area of steel plate core, if defined rank is not achieved, detection
When test sample directly from center segregation, center porosity seriously from brittle failure, the contraction percentage of area of steel plate core is very poor.It is other
Slab defects such as middle crack, triangular area crack etc. seriously affect the contraction percentage of area of whole plate, it is necessary to be eliminated.
5th step, rolling
Continuous casting steel billet first heats in continuous-type furnace, heats by the prolonged principle of low temperature, preheating section controls 600 DEG C
~800 DEG C of low temperature, to realize that early period slowly heats up, the control of bringing-up section temperature is at 1000 DEG C~1260 DEG C, soaking section temperature control
For system at 1180 DEG C~1240 DEG C, effective heating time guarantee reaches 11min/cm base thickness~15min/cm base thickness, makes continuous casting billet core
Portion also reaches 1180 DEG C~1240 DEG C, and tunneling boring temperature uniformly, after saturating burning goes out heating furnace, removes Surface Oxygen through high-pressure water descaling case
Change iron sheet, rolled on 4300mm heavy plate mill immediately, be just rolled to 1.3 times~2 times or so of finished product thickness, the big pressure of breaking down is rolled
System, reasonable distribution depress passage, and effective percentage pass reduction is not less than 15%, and reaches 20% or more as far as possible, then in 4300mm
Finished product thickness is rolled on finishing mill, finishing rolling control start rolling temperature at 800 DEG C~880 DEG C, roll at 780 DEG C~840 DEG C by finishing temperature
Steel plate controls cooling velocity in 3 DEG C/s~8 DEG C/s, then in special slow cooling cover by ACC water cooling to 550 DEG C~650 DEG C afterwards
Middle slow cooling is to room temperature.This step is the steel formability stage, first is that reaching the plate size (thick, wide, long) of needs, it is often more important that
Soldering continuous casting billet center porosity eliminates influence of the continuous casting billet metallurgical imperfection to steel plate core performance, and heating process is soldering continuous casting
Base center porosity creates excellent condition and weakens segregation to a certain extent simultaneously, and rolling process must reach on rolling opportunity appropriate
15% or more reduction ratio, soldering center porosity.ACC cooling is the needs of the final comprehensive performance of steel plate, but passes through control cooling
Intensity, which combines, rolls rear slow cooling, and reducing internal stress prevents the generation of secondary defect, while reducing [H] and its to the core contraction percentage of area
Influence.
6th step, heat treatment
Normalizing is quenched, and heat treatment is heated in continuous furnace, rank kind following for nominal-ultimate strength 460MPa,
Selection normalizing, 860 DEG C~930 DEG C of normalizing temperature, soaking time 0.3min/mm plate thickness~1.0min/mm plate thickness；Name is bent
The above rank kind of intensity 460MPa is taken, selection is quenched, and 830 DEG C~930 DEG C of hardening heat, soaking time 0.3min/mm plate thickness
~1.0min/mm plate thickness, is quickly quenching into room temperature, and 550 DEG C~690 DEG C of tempering temperature, soaking time 1.0min/mm plate thickness~
2.5min/mm plate thickness, air-cooled after coming out of the stove, soaking time is calculated since when steel plate is to temperature.Crystal grain, drop are refined by heat treatment
Low steel plate internal stress, further increases the contraction percentage of area of steel plate core.This step is that steel plate comprehensive performance such as stretches, is tough simultaneously
The necessary process for reaching prescribed requirement of property.
Steel plate thickness of the present invention reaches > 80mm~150mm, has good anti-lamellar tearing performance, can be widely applied to
The manufacture of the steel constructions such as skyscraper, large bridge, water power, ship.
Compared with the prior art, the advantages of the present invention are as follows:
(1), the anti-lamellar tearing function admirable of steel plate core is in particular at thickness half that Z-direction (thickness direction) is drawn
Stretch contraction percentage of area > 35%；
(2), the big thickness of steel plate, thickness reach > 80mm~150mm；
(3), manufactured using continuous casting billet.
Detailed description of the invention
Fig. 1 is 102mm thickness Q500D-Z35 steel plate Z-direction stretching fracture macro morphology during the present invention is implemented.
Fig. 2 is 102mm thickness Q500D-Z35 steel plate Z-direction stretching fracture microscopic appearance during the present invention is implemented.
Fig. 3 is 102mm thickness Q500D-Z35 steel plate microstructure during the present invention is implemented.
Fig. 4 is 150mm thickness Q345D-Z35 steel plate Z-direction stretching fracture macro morphology during the present invention is implemented.
Fig. 5 is 150mm thickness Q345D-Z35 steel plate Z-direction stretching fracture microscopic appearance during the present invention is implemented.
Fig. 6 is 150mm thickness Q345D-Z35 steel plate microstructure during the present invention is implemented.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment one:
Steel plate thickness 85mm, width 3200mm, steel grade Q500D-Z35.
The first step selects continuous casting steel billet thickness 370mm.
Second step just refines, and molten iron is pre-processed through KR, and S content takes off to after 0.012%, turns into 150t BOF top and bottom complex blowing
In furnace carry out just refining, just refining control molten steel [P] content 0.014%, control blow only [C] 0.04%, molten steel temperature after 1650 DEG C,
Tapping enters liquid steel refining process into ladle, and the pre-deoxidant of 3.2kg/t steel is added into molten steel for tapping process, and is blown into argon
Gas agitating molten steel.
Third step, refining, wherein LF refining process makes white slag, and the total dosage 22kg/t steel of refining agent feeds aluminum steel precipitation desoxydation,
Overall process sample detection molten steel [AL] content is in the total refining time 52min of 0.012~0.045%, LF, and molten steel temperature is at 1660 DEG C
Afterwards, into RH vacuum refining process, RH vacuum refining < 130Pa condition of high vacuum degree handles time 20min, molten steel after RH vacuum refining
Ca processing.Refining terminates final molten steel [O] content 9ppm, [H] content 0.9ppm, [S] content 0.001%, [Ca] content
0.0016%, [Ca]/[S] are 1.6.
Molten steel is cast into continuous casting steel billet, slab thickness 370mm, casting process steel on straight circular-arc type continuous casting machine by the 4th step
13 DEG C~22 DEG C of the liquid degree of superheat, drawing speed 0.7m/min, electromagnetic agitation electric current 300A, frequency 6HZ, dynamic soft-reduction drafts
11mm, depressing position is center segregation C1.0 grades in solidification end, continuous casting billet macrostructure, 0.5 grade of center porosity, without centre
The internal flaws such as crackle, triangular area crack.
5th step, rolling, continuous casting steel billet first heat in continuous-type furnace, and preheating section controls 600 DEG C~780 DEG C, add
1000 DEG C~1260 DEG C of hot arc, soaking section temperature control is at 1180 DEG C~1240 DEG C, and effective heating time 12min/cm base is thick, entirely
Section temperature is burnt uniformly, thoroughly, after high-pressure water descaling case removes scale on surface, is rolled on 4300mm heavy plate mill immediately
System, is just rolled to 2 times of finished product thickness, then the effective percentage pass reduction 15%~33% of breaking down rolls on 4300mm finishing mill
Finished product thickness, for finishing rolling control start rolling temperature at 850 DEG C, finishing temperature rolls rear steel plate by ACC water cooling to 650 DEG C at 820 DEG C,
Control 8 DEG C/s of cooling velocity, then in special slow cooling cover slow cooling to room temperature.
6th step, quenched, 900 DEG C of hardening heat, soaking time 0.8min/mm plate thickness is quickly quenching into room temperature, tempering temperature
620 DEG C of degree, soaking time 1.8min/mm plate thickness is air-cooled after coming out of the stove.
Final steel plate yield strength (RP0.2) 560MPa, tensile strength (Rm) 637MPa, elongation after fracture 23%, -20 DEG C
Shock absorption energy (KV2) is averaged 232J, and the Z-direction contraction percentage of area see the table below 1:
The 1 80mm yield strength Q500D-Z35 thick steel plate Z-direction contraction percentage of area of table
Embodiment two:
Steel plate thickness 102mm, width 3200mm, steel grade Q500D-Z35.
The first step selects continuous casting steel billet thickness 450mm.
Second step just refines, and molten iron is pre-processed through KR, and S content takes off to after 0.013%, turns into 150t BOF top and bottom complex blowing
In furnace carry out just refining, just refining control molten steel [P] content 0.011%, control blow only [C] 0.05%, molten steel temperature after 1670 DEG C,
Tapping enters liquid steel refining process into ladle, and the pre-deoxidant of 3.3kg/t steel is added into molten steel for tapping process, and is blown into argon
Gas agitating molten steel.
Third step, refining, wherein LF refining process makes white slag, and the total dosage 23kg/t steel of refining agent feeds aluminum steel precipitation desoxydation,
Overall process sample detection molten steel [AL] content is in the total refining time 65min of 0.011~0.043%, LF, and molten steel temperature is at 1670 DEG C
Afterwards, into RH vacuum refining process, RH vacuum refining < 130Pa condition of high vacuum degree handles time 25min, molten steel after RH vacuum refining
Ca processing.Refining terminates final molten steel [O] content 9ppm, [H] content 0.7ppm, [S] content 0.0008%, [Ca] content
0.0019%, [Ca]/[S] are 2.4.
Molten steel is cast into continuous casting steel billet, slab thickness 450mm, casting process steel on straight circular-arc type continuous casting machine by the 4th step
12 DEG C~25 DEG C of the liquid degree of superheat, drawing speed 0.5m/min, electromagnetic agitation electric current 400A, frequency 8HZ, dynamic soft-reduction drafts
14mm, depressing position is center segregation C0.5 grades in solidification end, continuous casting billet macrostructure, 0.5 grade of center porosity, without centre
The internal flaws such as crackle, triangular area crack.
5th step, rolling, continuous casting steel billet first heat in continuous-type furnace, and preheating section controls 630 DEG C~750 DEG C, add
1000 DEG C~1260 DEG C of hot arc, soaking section temperature control is at 1160 DEG C~1240 DEG C, and effective heating time 14min/cm base is thick, entirely
Section temperature is burnt uniformly, thoroughly, after high-pressure water descaling case removes scale on surface, is rolled on 4300mm heavy plate mill immediately
System, is just rolled to 2 times of finished product thickness, then the effective percentage pass reduction 18%~35% of breaking down rolls on 4300mm finishing mill
Finished product thickness, for finishing rolling control start rolling temperature at 840 DEG C, finishing temperature rolls rear steel plate by ACC water cooling to 620 DEG C at 820 DEG C,
Control 8 DEG C/s of cooling velocity, then in special slow cooling cover slow cooling to room temperature.
6th step, quenched, 850 DEG C of hardening heat, soaking time 0.9min/mm plate thickness is quickly quenching into room temperature, tempering temperature
590 DEG C of degree, soaking time 2.2min/mm plate thickness is air-cooled after coming out of the stove.
Final steel plate yield strength (RP0.2) 553MPa, tensile strength (Rm) 661MPa, elongation after fracture 26%, -20 DEG C
Shock absorption energy (KV2) is averaged 257J, and the Z-direction contraction percentage of area see the table below 2:
The 2 102mm yield strength Q500D-Z35 thick steel plate Z-direction contraction percentage of area of table
Sample breaks rear fracture in ductile fracture, and Z-direction stretching fracture pattern difference is as depicted in figs. 1 and 2.
Embodiment three
Steel plate thickness 150mm, width 2900mm, steel grade Q345D-Z35.
The first step selects continuous casting steel billet thickness 450mm.
Second step just refines, and molten iron is pre-processed through KR, and S content takes off to after 0.010%, turns into 150t BOF top and bottom complex blowing
In furnace carry out just refining, just refining control molten steel [P] content 0.011%, control blow only [C] 0.04%, molten steel temperature after 1660 DEG C,
Tapping enters liquid steel refining process into ladle, and the pre-deoxidant of 3.3kg/t steel is added into molten steel for tapping process, and is blown into argon
Gas agitating molten steel.
Third step, refining, wherein LF refining process makes white slag, and the total dosage 24kg/t steel of refining agent feeds aluminum steel precipitation desoxydation,
Overall process sample detection molten steel [AL] content is in the total refining time 59min of 0.016~0.052%, LF, and molten steel temperature is at 1680 DEG C
Afterwards, into RH vacuum refining process, RH vacuum refining < 130Pa condition of high vacuum degree handles time 28min, molten steel after RH vacuum refining
Ca processing.Refining terminates final molten steel [O] content 8ppm, [H] content 0.6ppm, [S] content 0.0006%, [Ca] content
0.0020%, [Ca]/[S] are 3.3.
Molten steel is cast into continuous casting steel billet, slab thickness 450mm, casting process steel on straight circular-arc type continuous casting machine by the 4th step
16 DEG C~25 DEG C of the liquid degree of superheat, drawing speed 0.5m/min, electromagnetic agitation electric current 400A, frequency 8HZ, dynamic soft-reduction drafts
14mm, depressing position is center segregation C0.5 grades in solidification end, continuous casting billet macrostructure, 0.0 grade of center porosity, without centre
The internal flaws such as crackle, triangular area crack.
5th step, rolling, continuous casting steel billet first heat in continuous-type furnace, and preheating section controls 600 DEG C~740 DEG C, add
1000 DEG C~1260 DEG C of hot arc, soaking section temperature control is at 1180 DEG C~1240 DEG C, and effective heating time 15min/cm base is thick, entirely
Section temperature is burnt uniformly, thoroughly, after high-pressure water descaling case removes scale on surface, is rolled on 4300mm heavy plate mill immediately
System, is just rolled to 1.5 times of finished product thickness, then the effective percentage pass reduction 19%~38% of breaking down rolls on 4300mm finishing mill
To finished product thickness, finishing rolling control start rolling temperature at 830 DEG C, roll rear steel plate at 810 DEG C and pass through ACC water cooling to 640 by finishing temperature
DEG C, control 8 DEG C/s of cooling velocity, then in special slow cooling cover slow cooling to room temperature.
6th step, normalizing, 900 DEG C of normalizing temperature, soaking time 0.6min/mm.
Final steel plate yield strength (ReL) 320MPa, tensile strength (Rm) 533MPa, elongation after fracture 24%, -20 DEG C of punchings
The average 182J of absorption energy (KV2) is hit, Z-direction contraction percentage of area see the table below 3:
The 3 150mm thickness Q345D-Z35 steel plate Z-direction contraction percentage of area of table
Example IV
Steel plate thickness 150mm, width 2800mm, steel grade Q460C-Z35.
The first step selects continuous casting steel billet thickness 450mm.
Second step just refines, and molten iron is pre-processed through KR, and S content takes off to after 0.008%, turns into 150t BOF top and bottom complex blowing
In furnace carry out just refining, just refining control molten steel [P] content 0.010%, control blow only [C] 0.04%, molten steel temperature after 1665 DEG C,
Tapping enters liquid steel refining process into ladle, and the pre-deoxidant of 3.5kg/t steel is added into molten steel for tapping process, and is blown into argon
Gas agitating molten steel.
Third step, refining, wherein LF refining process makes white slag, and the total dosage 27kg/t steel of refining agent feeds aluminum steel precipitation desoxydation,
Overall process sample detection molten steel [AL] content is in the total refining time 65min of 0.013~0.051%, LF, and molten steel temperature is at 1670 DEG C
Afterwards, into RH vacuum refining process, RH vacuum refining < 130Pa condition of high vacuum degree handles time 30min, molten steel after RH vacuum refining
Ca processing.Refining terminates final molten steel [O] content 7ppm, [H] content 0.5ppm, [S] content 0.0005%, [Ca] content
0.0020%, [Ca]/[S] are 4.0.
Molten steel is cast into continuous casting steel billet, slab thickness 450mm, casting process steel on straight circular-arc type continuous casting machine by the 4th step
18 DEG C~25 DEG C of the liquid degree of superheat, drawing speed 0.55m/min, electromagnetic agitation electric current 400A, frequency 8HZ, dynamic soft-reduction pressure
14mm is measured, depressing position is center segregation C0.5 grades in solidification end, continuous casting billet macrostructure, 0.0 grade of center porosity, without in
Between the internal flaws such as crackle, triangular area crack.
5th step, rolling, continuous casting steel billet first heat in continuous-type furnace, and preheating section controls 650 DEG C~800 DEG C, add
1030 DEG C~1240 DEG C of hot arc, soaking section temperature control is at 1180 DEG C~1220 DEG C, and effective heating time 15min/cm base is thick, entirely
Section temperature is burnt uniformly, thoroughly, after high-pressure water descaling case removes scale on surface, is rolled on 4300mm heavy plate mill immediately
System, is just rolled to 1.5 times of finished product thickness, then the effective percentage pass reduction 20%~37% of breaking down rolls on 4300mm finishing mill
To finished product thickness, finishing rolling control start rolling temperature at 820 DEG C, roll rear steel plate at 805 DEG C and pass through ACC water cooling to 650 by finishing temperature
DEG C, control 5 DEG C/s of cooling velocity, then in special slow cooling cover slow cooling to room temperature.
6th step matter, 850 DEG C of hardening heat, soaking time 0.6min/mm plate thickness is quickly quenching into room temperature, tempering temperature
600 DEG C of degree, soaking time 1.8min/mm plate thickness is air-cooled after coming out of the stove.
Final steel plate yield strength (ReL) 434MPa, tensile strength (Rm) 570MPa, elongation after fracture 25%, 0 DEG C of impact
The average 232J of energy (KV2) is absorbed, Z-direction contraction percentage of area see the table below 4:
The 4 150mm thickness Q460C-Z35 steel plate Z-direction contraction percentage of area of table
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (8)
1. the manufacturing method that a kind of continuous casting billet production guarantees the big thickness steel plate of the anti-lamellar tearing performance of core, it is characterised in that:
It the described method comprises the following steps:
The first step, the selection of continuous casting billet base type
Continuous casting steel billet is selected, specifically used continuous casting steel billet thickness is determined according to steel grade rank, steel plate thickness and width requirement；
Second step, just refining
Molten iron is after KR is pre-processed, into the just refining of progress in top and bottom combined blown converter；
Third step, refining
Refining includes LF refining and RH vacuum refining two procedures；
4th step, continuous casting steel machine
Molten steel is cast into continuous casting steel billet, dynamic soft-reduction drafts 8mm~16mm on straight circular-arc type continuous casting machine, depressing position exists
Solidification end is finally reached center segregation≤C1.0 grades, center porosity≤1.0 grade in continuous casting billet macrostructure；
5th step, rolling
Continuous casting steel billet first heats in continuous-type furnace, and tunneling boring temperature uniformly, after saturating burning goes out heating furnace, removes surface oxidation iron
Pi Hou is rolled on heavy plate mill immediately, is just rolled to 1.3 times~2 times of finished product thickness, and finished product thickness is then rolled on finishing mill
Degree, last slow cooling to room temperature.
2. the system that a kind of continuous casting billet production according to claim 1 guarantees the big thickness steel plate of the anti-lamellar tearing performance of core
Make method, it is characterised in that: continuous casting steel billet thickness is selected as 370mm~450mm in step 1, yield strength 460MPa and with
Lower rank, guarantees compression ratio 2.5~5.5, and the above rank of yield strength 460MPa guarantees compression ratio 3.0~5.5, if steel plate is wide
Degree exceeds 3000mm, then compensates compression ratio 0.2~0.7.
3. the system that a kind of continuous casting billet production according to claim 1 guarantees the big thickness steel plate of the anti-lamellar tearing performance of core
Make method, it is characterised in that: molten iron is pre-processed through KR in step 2, and S content takes off to after 0.015% or less, into top and bottom complex blowing
Just refining is carried out in converter, is controlled molten steel [P]≤0.015%, and control, which is blown, only [C] is not less than 0.03%, and molten steel temperature is at 1640 DEG C
After~1690 DEG C, into liquid steel refining process, the pre-deoxidant of no less than 3kg/t steel is added into molten steel for tapping process, and blows
Enter argon gas stirring molten steel.
4. the system that a kind of continuous casting billet production according to claim 1 guarantees the big thickness steel plate of the anti-lamellar tearing performance of core
Make method, it is characterised in that: LF refining process makes white slag in step 3, and the total dosage of refining agent is no less than 20kg/t steel, feeds aluminum steel
Precipitation desoxydation, 0.010% or more, molten steel deep deoxidation, deep desulfurization, the total refining time of LF are no less than overall process molten steel [AL] content
45min, molten steel temperature is after 1650 DEG C~1720 DEG C, into RH vacuum refining process, RH vacuum refining < 130Pa condition of high vacuum degree
The processing time is no less than 15min~30min, and molten steel Ca is handled after RH vacuum refining, and refining terminates to guarantee final molten steel [O] content
No more than 10ppm, [H] content is not more than 1.0ppm, and [S] content is not more than 0.002%, and [Ca] content reaches 0.0005%~
0.0040%, and guarantee that [Ca]/[S] reaches 1.5~4.0.
5. the system that a kind of continuous casting billet production according to claim 1 guarantees the big thickness steel plate of the anti-lamellar tearing performance of core
Make method, it is characterised in that: slab thickness 370mm~450mm in step 4, casting process control superheat of liquid steel 10 DEG C~25
DEG C, drawing speed 0.3m/min~1.0m/min, electromagnetic agitation electric current 200A~400A, frequency 5HZ~12HZ, dynamic soft-reduction
Drafts 8mm~16mm, depressing position is in solidification end.
6. the system that a kind of continuous casting billet production according to claim 1 guarantees the big thickness steel plate of the anti-lamellar tearing performance of core
Make method, it is characterised in that: by low temperature prolonged principle heating in step 5, preheating section controls 600 DEG C~800 DEG C low
Temperature, the control of bringing-up section temperature is at 1000 DEG C~1260 DEG C, and soaking section temperature control is at 1180 DEG C~1240 DEG C, effective heating time
Guarantee reaches 11min/cm base thickness~15min/cm base thickness, so that continuous casting billet core is reached 1180 DEG C~1240 DEG C, the big pressure of breaking down
Rolling, reasonable distribution depress passage, and effective percentage pass reduction is not less than 15%, and finishing rolling control start rolling temperature is 800 DEG C~880
DEG C, finishing temperature rolls rear steel plate by ACC water cooling to 550 DEG C~650 DEG C at 780 DEG C~840 DEG C, controls cooling velocity 3
DEG C/s~8 DEG C/s.
7. the system that a kind of continuous casting billet production according to claim 1 guarantees the big thickness steel plate of the anti-lamellar tearing performance of core
Make method, it is characterised in that: after step 5 terminates, rank kind following for yield strength 460MPa selects normalizing；It is right
In the above rank kind of yield strength 460MPa, selection is quenched, is quickly quenching into room temperature, comes out of the stove after tempering air-cooled, soaking time
Calculated since when steel plate is to temperature.
8. the system that a kind of continuous casting billet production according to claim 7 guarantees the big thickness steel plate of the anti-lamellar tearing performance of core
Make method, it is characterised in that: 860 DEG C~930 DEG C of normalizing temperature, soaking time 0.3min/mm plate thickness~1.0min/mm plate thickness；
830 DEG C~930 DEG C of hardening heat, soaking time 0.3min/mm plate thickness~1.0min/mm plate thickness, tempering temperature 550 DEG C~690
DEG C, soaking time 1.0min/mm plate thickness~2.5min/mm plate thickness.
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